@kirstenmcco - I'm no expert, so hopefully wiser members can give you more information. I believe the brown hard spot at the bottom is known as "corking" and is normal. But it looks to me that the middle part might be rotting, especially if it is soft. I am having a similar problem, except the area is not soft, it is hard and roots have started to sprout, so probably not same issue. From what I have learned so far, you should be able to cut the middle section off - above the soft rotting part, and again beneath the soft rotting part, and discard that entire rotting part. Let the top cut-off section dry for a week or so in a dimly lit area. Sprinkle some cinnamon on the cut off part of the base/original cactus to ward of more rotting. Over time, it should callous over and hopefully sprout a new section. Regarding the top part you cut off, after letting it callous over for a week or two, I think you can root it and eventually plant it. Hope this helps. (and if others correct me, feel free to take their advice!
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